SOX uses indentation to indicate the level of nesting of XML elements.
SOX 使用缩进来表示 XML 元素的嵌套层次。
The default value depends on the level of nesting of the current list.
缺省值依赖于当前列表的嵌套层次。
Visual user agents generally indent nested lists with respect to the current level of nesting.
可视化用户代理通常会对嵌套列表根据其嵌套的级别进行缩进。
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